Gall midge (GM) - resistant rice cultivars

Kulkarni, N.; Reddy, P.P.; Rao, S.S.

Gall midge (GM) - resistant rice cultivars

1988

Kulkarni, N. | Reddy, P.P. | Rao, S.S. (Agricultural Research Station, Warangal, Andhra Pradesh (India))

So far three varieties resistant to GM [gall midges]- kakatiya, Surekha, and Pothana - have been released for general cultivation. Cultivar's suited to different cropping practices and with improved grain type are also needed. One local practice is sowing rice under dry conditions and converting to irrigation when water is available in tanks. Two short-duration, GM-resistant varieties - WGL 18011 (CR44/W.12708) and WGL 20471-97 (BC.5/W.12708) - were sown in the 1987 wet season (WS) using the local seed drill at 30-cm spacing in 73.2 sq.m. plot. This dry condition was converted to wet conditions to 40 d. Both varieties matured in 100 d and yielded 3.0 t/ha. They have long slender grains. In minikit tests in the dry season (DS), WGL 20471-97 averaged 6.3 t yield/ha, 47% higher than Tella Hamsa. Both varieties are suitable for late, direct sowing. Two GM-resistant culture-WGL 44645 and WGL 48684 - have superior grain quality. WGL44645 (WGL 23022/Surekha) has a 125 d duration in WS and 135 d in DS. It has stiff straw and long slender grains. Grain quality is superior to that of varieties released earlier. In minikit trials, it yielded 4.2 t/ha against 2.8 t/ha for Tella Hamsa. It is tolerant to stem borer and hispa. WGL 48684 (WGL 27120/(Mashuri/WGL 17672)//Surekha) has a 135 d duration in WS. Grains are medium slender. It is also suitable for DS provided sowing is before December. Both varieties have 9% protein content.

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